/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.tsfile.v2.file.metadata.statistics;

import org.apache.iotdb.tsfile.exception.write.UnknownColumnTypeException;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.file.metadata.statistics.BooleanStatistics;
import org.apache.iotdb.tsfile.file.metadata.statistics.IntegerStatistics;
import org.apache.iotdb.tsfile.file.metadata.statistics.Statistics;
import org.apache.iotdb.tsfile.utils.ReadWriteIOUtils;

import java.io.IOException;
import java.io.InputStream;
import java.io.Serializable;
import java.nio.ByteBuffer;

public class StatisticsV2 {

    private StatisticsV2() {
    }

    public static Statistics<? extends Serializable> deserialize(
            InputStream inputStream, TSDataType dataType) throws IOException {
        Statistics<? extends Serializable> statistics = Statistics.getStatsByType(dataType);
        statistics.setCount((int) ReadWriteIOUtils.readLong(inputStream));
        statistics.setStartTime(ReadWriteIOUtils.readLong(inputStream));
        statistics.setEndTime(ReadWriteIOUtils.readLong(inputStream));
        switch (dataType) {
            case BOOLEAN:
                boolean firstBool = ReadWriteIOUtils.readBool(inputStream);
                boolean lastBool = ReadWriteIOUtils.readBool(inputStream);
                ((BooleanStatistics) statistics).initializeStats(firstBool, lastBool, 0);
                break;
            case INT32:
                int minValue = ReadWriteIOUtils.readInt(inputStream);
                int maxValue = ReadWriteIOUtils.readInt(inputStream);
                int firstValue = ReadWriteIOUtils.readInt(inputStream);
                int lastValue = ReadWriteIOUtils.readInt(inputStream);
                long sumValue = (long) ReadWriteIOUtils.readDouble(inputStream);
                ((IntegerStatistics) statistics)
                        .initializeStats(minValue, maxValue, firstValue, lastValue, sumValue);
                break;
            case INT64:
            case TEXT:
            case DOUBLE:
            case FLOAT:
                statistics.deserialize(inputStream);
                break;
            default:
                throw new UnknownColumnTypeException(dataType.toString());
        }
        statistics.setEmpty(false);
        return statistics;
    }

    public static Statistics<? extends Serializable> deserialize(
            ByteBuffer buffer, TSDataType dataType) {
        Statistics<? extends Serializable> statistics = Statistics.getStatsByType(dataType);
        statistics.setCount((int) ReadWriteIOUtils.readLong(buffer));
        statistics.setStartTime(ReadWriteIOUtils.readLong(buffer));
        statistics.setEndTime(ReadWriteIOUtils.readLong(buffer));
        switch (dataType) {
            case BOOLEAN:
                boolean firstBool = ReadWriteIOUtils.readBool(buffer);
                boolean lastBool = ReadWriteIOUtils.readBool(buffer);
                ((BooleanStatistics) statistics).initializeStats(firstBool, lastBool, 0);
                break;
            case INT32:
                int minValue = ReadWriteIOUtils.readInt(buffer);
                int maxValue = ReadWriteIOUtils.readInt(buffer);
                int firstValue = ReadWriteIOUtils.readInt(buffer);
                int lastValue = ReadWriteIOUtils.readInt(buffer);
                long sumValue = (long) ReadWriteIOUtils.readDouble(buffer);
                ((IntegerStatistics) statistics)
                        .initializeStats(minValue, maxValue, firstValue, lastValue, sumValue);
                break;
            case INT64:
            case TEXT:
            case DOUBLE:
            case FLOAT:
                statistics.deserialize(buffer);
                break;
            default:
                throw new UnknownColumnTypeException(dataType.toString());
        }
        statistics.setEmpty(false);
        return statistics;
    }
}
